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PostPosted: Mon May 01, 2017 7:46 pm 
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Joined: Thu Feb 07, 2013 9:19 am
Posts: 923
Location: Bedfordshire
Lucas Rita ignition
Haven't checked plugs yet
Yes - pressure regulator plus uprated needle valves
Haven't checked float levels. Although carbs were stripped and rebuilt.

Lots to check! I need to get used to old school fueling again...

Cheers Robin

And yes - polishing on hold :)

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Robin Martin
#335 Silvermachine
Small block 750 Moto Guzzi


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PostPosted: Mon May 01, 2017 9:11 pm 
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Location: North Norfolk
Robin,
Looking extremely good. Nearside pot appears to be running cooler than offside - I find an infra-red laser pointer temperature sensor invaluable for isolating all sorts of things. The "fettling" is a great challenge - you're obviously not far out - ensuring both carbs have equal provision/ identical settings (especially main jet needle position) essential. These small-block 750 Guzzi engines are really "peppy" and well-set-up will scamper up to 6,500 (and beyond). Wish I was more local.

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It's a 2CV Jim, but not as we know it.


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PostPosted: Tue May 02, 2017 9:07 am 
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MikeM wrote:
Robin,
Looking extremely good. Nearside pot appears to be running cooler than offside


Thanks Mike - I guess you are going by the colour of the header?

The nearside pot is the suspect. The fuel delivery goes to the offside pot first and then the nearside. My first thoughts are that I have screwed the Fuel King regulator down too much and the nearside is being starved of fuel.

Cheers, Robin

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Robin Martin
#335 Silvermachine
Small block 750 Moto Guzzi


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PostPosted: Tue May 02, 2017 9:15 am 
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Location: N.Yorks
I have always believed in a split in fuel lines to the carbs. In theory it's not necessary but in practice equal lengths of line going from a tee at the FilterKing to each carb rules out any doubt over uneven supply.


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PostPosted: Wed May 03, 2017 2:04 pm 
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yes, I had a guzzi that fed one after the other,, the filter blocked and the nearest carb to the filter ran ok,the other one nothing..with 30 miles of hilly french motorway to go it was not fun...


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PostPosted: Wed May 03, 2017 2:53 pm 
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Hmm. That looks another mod to add to the list for next winter than. If not before....

Robin

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Robin Martin
#335 Silvermachine
Small block 750 Moto Guzzi


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PostPosted: Wed May 03, 2017 3:03 pm 
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More appropriately tomorrow if not before!


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PostPosted: Wed May 03, 2017 4:18 pm 
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Martin & Mike,
wouldn't a weak mixture result in that cylinder running hotter?
It would certainly cause more 'exhaust blueing', since a weak mixture burns slower, to the extent that combustion may not be complete when the exhaust valve opens.

Ken



MartinClan wrote:
MikeM wrote:
Robin,
Looking extremely good. Nearside pot appears to be running cooler than offside


Thanks Mike - I guess you are going by the colour of the header?

The nearside pot is the suspect. The fuel delivery goes to the offside pot first and then the nearside. My first thoughts are that I have screwed the Fuel King regulator down too much and the nearside is being starved of fuel.

Cheers, Robin


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PostPosted: Thu May 04, 2017 12:38 pm 
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Joined: Mon Sep 05, 2016 8:45 pm
Posts: 202
Location: Earlston, Scottish Borders
Hi Robin,

Did you use a 'Gunson ColourTune' in your youth? You can now buy an adaptor for smaller plugs used in motorcycle engines. They are still a great bit of kit 40 years on!

Ade


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